<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>CSS 和 HTML 结合方式1</title>
    <link rel="stylesheet" href="./css/a.css">
</head>
<body>

<!--外部样式-->
<div>hello css</div>

<p>哈哈</p>

</body>
</html>